If all else fails, this won't.....
Put your pan in a large plastic bag, hold your breath and pour some straight ammonia into the bag and twist it closed. Start breathing again, and seal it up with a twist tie. Set it outside, hopefully the sun will be shining on it. The next day it will clean up slick as a whistle.
Life is not measured by the number of breaths we take, but rather by the moments that take our breath away.